In this paper, different types of web session similarity metrics are compared and combined for better web session clustering. Syntactic and co-occurrence information are used for similarity calculation. Syntactic information on a web page includes the place of the page in the directory hierarchy. Co-occurrence information is the amount of the occurrences of two web pages in the same sessions. V...

The central result of this paper is an analytic duality relation for real-valued Lévy processes killed upon exiting a half-line. By Nagasawa’s theorem, this yields a remarkable time-reversal identity involving the Lévy process conditioned to stay positive. As examples of applications, we construct a version of the Lévy process indexed by the entire real line and started from −∞ which enjoys a n...

We propose a new approach to perform approximate similarity search in metric spaces [8]. The idea at the basis of this technique is that when two objects are very close one to each other they ’see’ the world around them in the same way. Accordingly, we can use a measure of dissimilarity between the view of the world, from the perspective of the two objects, in place of the distance function of ...

In this paper, Adjusted Rand Index (ARI) is generalized to two new measures based on matrix comparison: (i) Adjusted Rand Index between a similarity matrix and a cluster partition (ARImp), to evaluate the consistency of a set of clustering solutions with their corresponding consensus matrix in a cluster ensemble, and (ii) Adjusted Rand Index between similarity matrices (ARImm), to evaluate the ...

In this paper we describe the three approaches we submitted to the Semantic Textual Similarity task of SemEval 2012. The first approach considers to calculate the semantic similarity by using the Jaccard coefficient with term expansion using synonyms. The second approach uses the semantic similarity reported by Mihalcea in (Mihalcea et al., 2006). The third approach employs Random Indexing and ...

In image database applications, it is desirable that functions such as searching, browsing, and partial recall be done without totally decompressing the images. Using wavelet-compressed images is becoming increasingly popular. Image databases, and edge images derived from such compressed images can be viewed as indexes that can be queried by examples. In this research, a fractional code generat...

Grottoes, with caves and statues, are an important part of immovable heritage. Statues in a particular grotto setting often similar geometric form artistic style, identifying the similarity between these statues can help provide references for value recognition, condition assessment, repair, virtual restoration statues. Traditionally, such reference information mainly depended on expert empiric...